146 Proceedings of the Ohio Academy of Science 
SCIENTIFIC SESSIONS. 
The complete scientific program of the meeting follows: 
Presidential Address. 
““The Einstein Theory of Relativity and Gravitation,” 
F. C. BLAKE 
Public Lecture. 
‘‘Photographing Sound Waves from Large Guns and Pro- 
BSS) Gl NOR? at ia ele ie Saad DAYTON C. MILLER 
Symposium Before Physics Section. 
The Constitution of the Atom: 
(a) The Planetary Atom of the Physicist....:............. S. J. M. ALLEN 
(b) Why, Not (One= Kind" of Atom: Onli wes nets ote R. C. Gowpy 
(co) Discussion; edt biy. sso use cee cetera nani else aia oc W. L. EvANs 
Papers 
Claws of Arachnids......... 8 CU sata een RM AE i Fl W. M. BARRows 
The Arizona Boll Weevil (Anthonomus grandis var. thurberia) with 
Special Reference to Steps Taken by the Arizona Commission of Agri- 
culture and Horticulture to Prevent its Establishment in Cultivated 
Cottons yReadibyatitles pas heen serine ee inet ctr erioiy oe at ese ore Don C. Mote 
. Aphelopus theliae (Gahan) and the Changes Produced in Thelia by this 
IP hney ls) Kamba (Ibehanyemal)). sAgnenacenaocsoqoucuddosc S. I. KORNHAUSER 
The Intestinal Parasites of Overseas Troops as Compared with Home 
Services roopss wlO mimic aceite renee lactemteaereeleterers of S. I. KORNHAUSER 
A New Disease, Black Tumor, of the Catfish. 5 min.......... R. C. OSBURN 
Classification of the Opalinide. 10 min................ MAYNARD M. METCALF 
Geographical Distribution of the Opalinide. 15 min... MAYNARD M. METCALF 
Factors in the Distribution of Aquatic Snails in Lake Erie. 20 min. 
(Ganteriy)rsck vac see eens BC, ener Ae ena len ARDC iirunit bac F. H. KRECKER 
Caddis-fly Larve as Agents in Distribution of Fresh Water Sponges. 5 min. 
F. H. KRECKER 
Notes on Some Tropical Homoptera. 8 min.............. HERBERT OSBORN 
. Generic and Specific Characters from the Male Genitalia of Syrphide 
(UB shear )ras WO) Scayh oan (bean: cal) ee eae omen a Sekar eR te ro C. LL; METrcAur 
Some Myriapods of Put-in-Bay. 10 min. ............... STEPHEN R. WILLIAMS. 
The Chondrocranium of Syngnathus fuscus. 20 min........J. E. KINDRED 
INGlelinsioraisy (Wor eaves IBveaaksy Ore (Olauvoly MO0)inaviold Sb oeuacsnogacd sos ot LyNnpDs JONES. 
Peirce Nie rattan Groupsiy 2UpAIM stl 2 co icls een Sais anne te abbeys eee LYNDS JONES 
. Two Recently Destructive Clover Insects of Western Ohio. 5 min..... 
i. Hy PARES 
. The Preservation of Native Flora and Fauna. 10 min....... HERBERT OSBORN 
. New Economic Applications for the Mangrove. 8 min. (Lantern) 
H. H. M. BowMAN 
. The Progress of Revegetation in the Katmai District. 15 min. (Lantern) 
RosBert F. GRIGGsS. 
